INTRAMYOCARDIAL PRESSURE AND ITS RELATION TO AORTIC BLOOD PRESSURE

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Abstract
A method of optical recording is described for measuring directly the extent of intramyocardial pressure at any desired depth in the wall of the left ventricle, and the contour of such pressure curves is described. By means of simultaneous records of the pressure from the ventricular wall and from the aorta the following relations were found to obtain. During the height of systole there exists in the wall of the left ventricle a gradient of pressure decreasing from the deeper to the more superficial layers. In the depth of the myocardium this pressure is always greater than aortic pressure but in the superficial layers it may be equal to or even less than the pressure in the aorta and coronary arteries. While the deeper coronary vessels must become completely occluded during the height of cardiac contraction there may be a continuous forward movement of the blood in the more superficial layers of the myocardium.

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